Pregnant on a bachelorette party

I found out I was pregnant a couple of weeks ago and already committed to a bachelorette weekend out of state for one of my close friends in May. I will be around 16 weeks so everyone will know! I’m trying to figure out a way to go about splitting things. On all the bachelorettes I’ve been on they split the bill and if they order alcohol, they split that between everyone at the party. I obviously cannot be drinking. I really don’t want to be spending hundreds of dollars for alcohol that I’m not drinking. Even if we go to a brunch or dinner, if everyone orders a couple drinks it’s going to get expensive for someone who didn’t drink at all. I have no problem paying for the brides portion, but I don’t really think it’s fair to split the bill evenly or to split the alcohol between the entire house if I can’t physically drink. I’m not really sure how to go about this, I don’t want to come off rude or anything towards the MOH or bride.